Perforator for printing-presses.



W. H. THOMPSON.

PERFORATOR FOR PRINTING PRESSES.

APPLICATION FILED JAN- 7. 1916 1,203,436. Patented Oct. 31,1916.

5 .9 n (JP .3

Witnesses Inventor Atto rnevs ml: mmms PETERS co. Puomumm WASHINGTON. v. c.

UNITED- STATES PATENT ()FFICE.

WILLIAM HENDEESON THOMPSON, OF MEMPHIS, TENNESSEE, AS SIGNOR To THOMAS McC. SPARKS, WILLIAM M. SPAR KS AND GEORGE H. COLE, ALL RIPLEY, TEN- N ESSEE.

PERFORATOR FOR PRINTING-PRESSES.

Specification of Letters, Patent.

Application filed January ,1916. Serial No. 70,884.

To all whom it may concern:

Be it known that I, lVI'LLIAM HENDERSON THOMPSON, a citizen of the United States, residing at Memphis, in the county of Shelby and State of Tennessee,have invented a new and useful Perforator for Printing-Presses, of which the following is a specification.

The present invention appertains to a perforator for printing presses, and aims to provide a perforator of novel and improved construction, and applicable to a platen printing press, whereby the paper and other stock which is being imprinted, will be perforated simultaneously with the. printing operation.

It is also within the scope of the invention to provide a perforator for printing presses, which is improved generally in its construction and details, to enhance the utility and efliciency thereof, the device being simple, substantial, compact, non-encumbering and inexpensive in construction, as wellas being convenient, serviceable and practical in use.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein Figure 1 is a plan view of the perforator. Fig. 2 is a view illustrating the perforator,

. partly in elevation and the remainder 1n longitudinal section. Figs. 3, 4 and 5 are enlarged sectional details taken on the lines 33, l l and 55, respectively, of Fig. 2.

The present perforator embodies a bar or elongated stock 1 constructed of suitable metal or material, and having a widened or enlarged basal portion 2, provided with an aperture 3 and lip l for attaching the basal or butt end 2 of the bar 1 to the gripper bar of the platen printing press, in order that the bar 1 will assume the position of the ordinary gripper carried by the gripper bar, to cooperate properly with the type form and platen. r

The bar 1 is provided with an elongated longitudinal slot 5 between its edges, in which is movably or slidably disposed, an

elongated perforator blade 6. The blade 6 is disposed longitudinally Within the slot 5, and one edge of the blade is serrated or toothed, as at'i', said toothed or active edge being disposed slidably within the slot 5, whlle the other edge projects in the rear of the bar 1. The active edge of the blade may The blade 6 is carried by a longitudinal I shoulder or bar 8 parallel with the bar 1 and co-extensive in length with the blade 6. The bar 8 provided with a longitudinal channel or groove 9 in which the inactive edge of the blade 6 is-fitted snugly, and screws 10 or other securing elements are engaged through the bar 8 and blade 6 to securely hold said blade in place relative to the bar 8.

In order to hold the bar 8 assembled with the bar 1 and to limit the movement of the bar 8 relative to the bar 1, the bar 8 is provided adjacent its ends with pairs of apertures or bores 11 at the opposite sides of the blade 6, and said bar 8 is provided with outer counter bores 12. Screws or equivalent elements 13 threadedly or otherwise engage the bar 1 at the opposite sides of the slot 5 and pass slidably through the bores 11, and the free ends of said screws are provided with heads 14; Working snugly within the counter bores 12. The counter bores 12 are elongated, whereby when the bar. 8 is brought against the bar 1, the heads 14 will still be within the counter bores 12, so that the screws will not project from the device as would be objectionable. "The screws 13 thus guide the bar 8 in its movement to and from the bar 1, and said screws also limit the separation of the bars in a satisfactory and eflicient manner.

The bars are normally separated to retract the blade, and to this end leaf springs 15 have their remote ends riveted or otherwise fastened, as at 16, to the bar 1 beyond the ends of the slot 5 and at the same side of the bar 1 as the bar 8. The leaf springs 15 project toward one another and are bent' so as to flex away from the bar 1 when the parts are released. The free ends of the springs 15 have slots or-bifurcated portions 17 receiving the ends of the blade 6, the free ends of the springs being disposed between the bars 1 and 8. The ends of the bar 8 are provided with inner cut away portions or rabbets 18 in which the ends of the springs 15 work, whereby the bar 8 can move completely against the bar 1 without the interference of the springs with such movement.

In practice, the basal portion 2 of the bar 1 is attached to the gripper bar of the printing press, to occupy the position of one of the ordinary grippers, and this will cause the perforator to be properly or timely carried to position adjacent the type form during the printing operation, and with the shoulder or bar 8 bearing against the furniture of the type form which is inserted to provide the blank space in the paper or stock which is to be perforated. The active edge of the blade thus projects away from the type form, whereby the paper or stock carried against the form by the platen, will be brought into engagement with the active edge of the blade 6. Then the platen is moved adjacent the form for completing the impression, the shoulder or bar 8 in bearing against the wood furniture of the form, and the bar 1 being moved toward the shoulder or bar 8 by the platen, will cause the bars 1 and 8 to be forced toward one another against the tension of the springs 15, and this will cause the blade to be pushed through and out of the slot 5 toward the paper or stock. As a result, the active edge of the blade is projected to perforate the paper.

N hen the platen is retracted and the gripper bar returned to idle position, the perforator will, by reason of the pressure having been removed from the bars 1 and 8, be withdrawn from the paper or sheet, and the paper or sheet will thus be left smoothly upon the platen from which it is removed as usual by the press feeder. It is to be noted that when the pressure upon the shoulder or bar 8 is removed, the shoulder or bar will immediately spring away from the bar 1, to draw the blade into inactive position, with the active edge of the blade retracted within the slot 5. This will prevent the paper or sheet from being pulled from the gage pins on the platen of the printing press after the imprint has been made, and the present device will therefore avoid the tendency of the sheet of paper adhering or sticking to the perforator.

The present device thus enables the paper or stock to be perforated at the same time that the imprint is made upon the paper or stock, and the present device also acts as a gripper, and eliminates the possibility of a slur being given to the printing upon the paper or stock.

The present device may be constructed in various sizes, or proportions, according to the nature of the work tobe done, and the active edge of the blade may be of different formations when various forms of perfora tions, slits or scores are to be made.

Having thus described the invention, what is claimed as new is A perforator comprising a bar having a slot, a blade having an active edge normally retracted within said slot and projectable therefrom, a second bar having a channel in which the other edge of the blade is fitted, means for securing the blade within the second bar, the ends of the second bar having inner rabbets, and leaf springs secured to the first mentioned bar beyond the ends of said slot and having their free ends working in said rabbets to move the bars apart, the free ends of the springs being slotted and receiving the ends of the blade.

In testimony that I claim the foregoing as my own I have hereto a'iiixed my signa ture in the presence of two witnesses.

WILLIAM HENDERSON THOMPSON.

Vitnesses JOHN WV. FARLEY, S. B. HATHORN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

